Heading home from work Thursday, on interstate rolling 75, I noticed my coolant temp start to rise. I pulled off at the next exit and the temp started to drop. After a few minutes the temp was back to normal so I headed out. When ever I would go over 60 or pull up a hill the temp would climb. When I got home I checked it out. everything seems fine. The fan looked a little slow. Friday I put a new radiator and fan clutch on. When I start out the truck runs great. It will stay at temp for 10 to 15 minutes and then when you start running about 60 the temp will climb. Could it be a head gasket? No white smoke, truck runs great, no coolant in oil. What should I check next?

Thank you both! It was the Tstat. I have never had one do that. I have only had them stick closed or open. You learn something new every day. I owe you both a few cold drinks for the help. Much appreciated.

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